Scholarly record
PORTABLE NUCLEAR MAGNETIC RESONANCE RELAXOMETRY IN THE STUDY OF PETROPHYSICAL PROPERTIES OF RESERVOIR ROCKS
Abstract
Reliable estimation of hydrocarbon feedstock reserves is based on determining the reservoir's fluid recoverability, which is done by laboratory studying the microscopic structure of the core samples. Impulse nuclear magnetic resonance relaxometery (NMR) is one of the most perspective methods for studying petrophysical properties of rocks. We developed a portable NMR relaxometer, which can be used both in the laboratory and in the field while drilling. NMR analysis of the drill mud can be done directly on the well in real time. For mud sizes of 3-5 mm, the results coincide with the analysis of the core. We present methodical issues of laboratory investigations with NMR relaxometer. We propose a method for NMR experiment parameters selecting providing the maximum level of the observed signal. We have developed a method for inversion of relaxation curves based on the Fletcher-Reeves minimization (conjugate gradients). The software is running on a high-performance computer complex including an NVIDIA video adapter. For sufficient accuracy of NMR spectra approximation we used the function f(T2), belonging to three classes: discrete, piecewise-constant and piecewise-linear. Software for processing and geological-geophysical interpretation of relaxation curves is taking into account medium models and preliminary geological information. Proposed analysis method allows working with core in laboratory and with mud directly in the drilling site. Reliable initial data obtained during NMR studies of the petrophysical properties of reservoir rocks allow us to refine the empirical relationships between the relaxation time distribution and the pore space characteristics of the geological media studied. This makes it possible to increase the reliability of the analysis of reservoir properties of core samples, to increase the validity of assessments of reserves of hydrocarbon deposits and their oil recovery ratio.
Publication Impact Profile
- Captures
- Mendeley - Readers: 2
Publication details
References0
Structured references will appear here after the reference import pass. The count is preserved now so the scholarly record is not incomplete.
View or Download full articleAccess options
SWS access login
Login as SWS Scientific CommitteeLogin as SWS Scientific PartnerLogin as SWS AuthorAuthors and approved SWS contributors will read and export their own linked papers after identity matching by SWS profile, email and SGEM GlobalID.
For librarian assistance: [email protected]
Purchase Instant Access
- Article can be downloaded after successful payment.
- Article may be used according to SWS library access terms.
- Article cannot be redistributed.